/Engine/Source/Runtime/InteractiveToolsFramework/Public/InteractiveTool.h
Note: the current design of this system assumes that the CDO will keep the referenced objects alive. This assumption is incorrect in Runtime builds, and some external mechanism must be used to keep the elements in the CachedPropertiesMap alive. Save the values of this PropertySet with the given CacheIdentifier. The Tool parameter is currently ignored.
virtual void SaveProperties ( [UInteractiveTool](API\Runtime\InteractiveToolsFramework\UInteractiveTool) * SaveFromTool, const [FString](API\Runtime\Core\Containers\FString) & CacheIdentifier )